Can set to follow a friend

lib/helpers/friends_helper.dart

@@ -52,6 +52,20 @@ class FriendsHelper {
     return response.code == 200;
   }
 
+  /// Update following status for a friend
+  Future<bool> setFollowing(int friendID, bool follow) async {
+    final response = await APIRequest(
+      uri: "friends/setFollowing",
+      needLogin: true,
+      args: {
+        "friendID" : friendID.toString(),
+        "follow": follow.toString()
+      }
+    ).exec();
+
+    return response.code == 200;
+  }
+
   /// Remove a friend from the list
   Future<bool> removeFriend(int friendID) async {
     final response = await APIRequest(

lib/ui/screens/friends_list_screen.dart

@@ -111,6 +111,7 @@ class _FriendsListScreenState extends SafeState<FriendsListScreen> {
                   ? AcceptedFriendTile(
                       friend: _friendsList[i],
                       user: _usersInfo.getUser(_friendsList[i].id),
+                      onSetFollowing: _setFollowingFriend,
                       onRequestDelete: _deleteFriend,
                     )
                   : PendingFriendTile(
@@ -134,6 +135,18 @@ class _FriendsListScreenState extends SafeState<FriendsListScreen> {
     _loadList();
   }
 
+
+  /// Update following status of a friend
+  Future<void> _setFollowingFriend(Friend friend, bool follow) async {
+    loading = true;
+
+    if(!await _friendsHelper.setFollowing(friend.id, follow))
+      showSimpleSnack(context, tr("Could not update following status!"));
+
+    _loadList();
+
+  }
+
   /// Handles deletion request of a friend
   Future<void> _deleteFriend(Friend f) async {
     final choice = await showDialog<bool>(

lib/ui/tiles/accepted_friend_tile.dart

@@ -9,23 +9,27 @@ import 'package:flutter/material.dart';
 ///
 /// @author Pierre HUBERT
 
-enum _FriendMenuChoices { REMOVE }
+enum _FriendMenuChoices { REMOVE, TOGGLE_FOLLOWING }
 
 typedef OnRequestDeleteFriend = void Function(Friend);
+typedef OnSetFollowing = void Function(Friend, bool);
 
 class AcceptedFriendTile extends StatelessWidget {
   final Friend friend;
   final User user;
   final OnRequestDeleteFriend onRequestDelete;
+  final OnSetFollowing onSetFollowing;
 
-  const AcceptedFriendTile(
-      {Key key,
-      @required this.friend,
-      @required this.user,
-      @required this.onRequestDelete})
-      : assert(friend != null),
+  const AcceptedFriendTile({
+    Key key,
+    @required this.friend,
+    @required this.user,
+    @required this.onRequestDelete,
+    @required this.onSetFollowing,
+  })  : assert(friend != null),
         assert(user != null),
         assert(onRequestDelete != null),
+        assert(onSetFollowing != null),
         super(key: key);
 
   @override
@@ -45,10 +49,22 @@ class AcceptedFriendTile extends StatelessWidget {
             ),
       trailing: PopupMenuButton<_FriendMenuChoices>(
         itemBuilder: (c) => [
+              PopupMenuItem(
+                child: Row(
+                  children: <Widget>[
+                    Icon(friend.following
+                        ? Icons.check_box
+                        : Icons.check_box_outline_blank),
+                    Container(width: 10.0),
+                    Text(friend.following ? tr("Following") : tr("Follow")),
+                  ],
+                ),
+                value: _FriendMenuChoices.TOGGLE_FOLLOWING,
+              ),
               PopupMenuItem(
                 child: Text(tr("Remove")),
                 value: _FriendMenuChoices.REMOVE,
-              )
+              ),
             ],
         onSelected: _selectedMenuOption,
       ),
@@ -59,6 +75,11 @@ class AcceptedFriendTile extends StatelessWidget {
     if (value == null) return;
 
     switch (value) {
+      //Toggle following status
+      case _FriendMenuChoices.TOGGLE_FOLLOWING:
+        onSetFollowing(friend, !friend.following);
+        break;
+
       //Delete friend
       case _FriendMenuChoices.REMOVE:
         onRequestDelete(friend);